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Vishay General Semiconductor - Diodes Division SMBJ48AHE3/52
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- Part No.:
- SMBJ48AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48AHE3/52.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,261
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Product details
Overview
SMBJ48AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ48AHE3/52 datasheet, SMBJ48AHE3/52 pinout, SMBJ48AHE3/52 application, or SMBJ48AHE3/52 equivalent, this device is evaluated for ESD and surge immunity in 24–48 V DC systems, automotive body electronics, and telecom line protection where low-leakage (<1.0 µA at VWM) and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking. Its junction exhibits glass passivation for stable avalanche behavior, low incremental surge resistance (enabling tight VC–IPPM correlation), and fast response time (<1 ps) to transient events such as inductive switching spikes and lightning-induced surges.
Thermally, it delivers 5.0 W steady-state power dissipation at TA = 50 °C with RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; sets system working voltage ceiling. |
| VBR min/max | 53.3 V / 58.9 V at IT = 1 mA - Ensures reliable turn-on above nominal rail while avoiding false triggering during normal operation. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; defines worst-case overvoltage stress. |
| PPPM | 600 W - Peak transient energy handling capacity; supports repetitive 0.01% duty cycle surges per JEDEC standards. |
| IPPM | 7.8 A - Peak surge current capability under standardized 10/1000 µs waveform; determines minimum series impedance for protection design. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage ensures minimal power loss and no interference with high-impedance sensing nodes. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and thermally constrained PCB layouts. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), compatible with reflow soldering up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal avalanche junction | Connected to protected line; clamps positive transients toward ground when anode is grounded. |
| Anode | Cathode of internal avalanche junction | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and power distribution units requiring long-term reliability under thermal cycling and humidity. |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV surge) on 24–48 V DC rails without degradation when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage margin between breakdown and clamping, reducing stress on downstream silicon like microcontrollers and gate drivers. |
| 1.0 µA max reverse leakage @ VWM | Preserves battery life in always-on systems and avoids loading precision analog sensor references or high-Z communication lines. |
| Glass-passivated junction | Ensures consistent avalanche characteristics across temperature and lifetime, critical for field-deployed industrial equipment. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 48 V DC input stage of programmable logic controller (PLC) power module against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converter ICs. Use Value: Limits voltage excursion to ≤77.4 V during 7.8 A surge, preventing latch-up or permanent damage to buck controller and gate drivers. |
Use Scenario: Safeguarding LIN bus transceiver and window motor driver outputs in BCM against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBAT-connected supply pins to absorb 10/1000 µs pulses up to 600 W without derating. Use Value: Maintains <1.0 µA leakage at 48 V nominal, eliminating standby current penalty while meeting ISO 7637-2 Pulse 5a requirements. |
| Telecom Line Interface Protection | Industrial Sensor Signal Conditioning |
|
Use Scenario: Shielding RS-485 transceiver power pins in outdoor base station equipment exposed to lightning-induced surges on 24 V auxiliary supply. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail feeding isolated data interface ICs, coordinated with upstream fuse and common-mode choke. Use Value: Fast sub-nanosecond response captures edge-of-surge energy before IC internal ESD structures activate, extending system MTBF. |
Use Scenario: Guarding analog front-end of 4–20 mA current loop transmitter against accidental 24 V wiring faults and electrostatic discharge. IC Role / Device Role / Timing Role: Low-leakage TVS on sensor excitation supply line to prevent forward conduction into precision op-amp bias networks. Use Value: 53.3–58.9 V VBR range ensures no conduction during normal 24 V operation while triggering reliably above 60 V fault thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48AHM3/52 | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | No functional difference; selected where halogen-free BOM compliance is mandated (e.g., EU public infrastructure projects). | Direct substitution if halogen-free certification is required; same footprint, thermal profile, and surge performance. |
| SMBJ48A-E3/52 | RoHS-compliant commercial grade (non-AEC-Q101); otherwise matches SMBJ48AHE3/52 in VWM, VBR, VC, and PPPM. | Approved for industrial/commercial use only; not validated for automotive temperature cycling or lifetime reliability testing. | Cost-optimized alternative for non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMBJ48AHE3/52, the HM3 variant adds halogen-free compliance without altering protection performance, while the E3 variant removes AEC-Q101 validation - making HE3 the only choice for automotive-critical 48 V subsystems requiring certified reliability.
Availability
SMBJ48AHE3/52 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line interfaces, and sensor signal conditioning requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMBJ48AHE3/52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets robust transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where clamping accuracy, low leakage, and long-term stability under thermal stress are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ48AHE3/52 under standard surge conditions?
The SMBJ48AHE3/52 has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 7.8 A using the 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ48AHE3/52 maintains this clamping performance across its full operating temperature range.
Does SMBJ48AHE3/52 meet automotive qualification standards?
Yes, SMBJ48AHE3/52 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS power domains. The HE3 suffix explicitly denotes RoHS compliance and AEC-Q101 validation per Vishay's ordering nomenclature. This qualification covers temperature cycling, humidity resistance, and long-term surge endurance testing required for under-hood deployment.
How does the leakage current of SMBJ48AHE3/52 compare to similar TVS diodes at 48 V?
SMBJ48AHE3/52 specifies ≤1.0 µA maximum reverse leakage current at its 48 V stand-off voltage (VWM), which is among the lowest in the SMBJ family and significantly tighter than many competing 48 V TVS devices that specify up to 5 µA. This ultra-low leakage preserves battery runtime in always-on systems and prevents loading of high-impedance sensor reference paths - a key advantage in precision industrial measurement circuits.
What is the thermal resistance from junction to ambient for SMBJ48AHE3/52?
The SMBJ48AHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal. This value assumes standard FR-4 PCB construction and natural convection cooling. For higher-power or elevated-temperature environments, designers should verify junction temperature using RθJL = 20 °C/W to ground plane or heatsink.
Can SMBJ48AHE3/52 be used in bidirectional protection configurations?
No, SMBJ48AHE3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMBJ48CA). Using SMBJ48AHE3/52 in reverse-biased configurations risks permanent junction damage due to lack of symmetrical avalanche structure. For AC-coupled or differential signal lines, select the appropriate CA version or pair unidirectional devices back-to-back.
SMBJ48AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ48AHE3/52 FAQ
1.How can I place an order for SMBJ48AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48AHE3/52 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ48AHE3/52 reliable?
The price and inventory of SMBJ48AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ48AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48AHE3/52?
SMBJ48AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48AHE3/52 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ48AHE3/52?
For technical support, including SMBJ48AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48AHE3/52 requirements.
6.How does Aetrix verify that SMBJ48AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ48AHE3/52 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ48AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ48AHE3/52?
All SMBJ48AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48AHE3/52, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ48AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ48AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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